Leases (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Leases Future Minimum Payments Receivable Abstract
2012	$ 1,807,885
2013	1,718,403
2014	1,609,279
2015	1,425,804
2016	1,232,154
Thereafter	6,045,584
Number Of Tenants Contributing Ten Percent Or More Of Total Revenues	0
Percentage Rent	8,482	7,912	8,394
Additional Rent Due Annually From Tenant	5,000
Additional Rent Due From Tenant	41,983
Operating Leases Future Minimum Payments Due Abstract
2012	31,472
2013	31,666
2014	31,945
2015	30,596
2016	26,470
Thereafter	1,037,730
Rent Expense	37,177	36,417	35,011
Capital Leases Future Minimum Payments Due Abstract
2012	707
2013	706
2014	707
2015	706
2016	707
Thereafter	16,014
Total Minimum Obligations	19,547
Interest Portion	12,876
Present Value Of Net Minimum Payments	6,671	6,714
Capital Lease Terms	5-20
Property Leased Under Capital Leases Cost	6,216	6,216
Property Leased Under Capital Leases Accumulated Depreciation	$ 2,184	$ 2,029